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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0a1bdf1c93a4a5ff06d22ae21b0c4733307dd970b01ef594ffb7c0944c88b9b' 
  AND token = 'Eixi84z11ibo/IzVBQKw10LFANY2JYRlqXiy3HwXYEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}